In what ways do the three terms differ?

[louislaolu]

non-relativistic physics，classical mechanics and low speed physics
I think these three terms are synonyms, but I am not sure whether there is any stylistic difference between them?
Is "low speed physics" informal or outdated or non-standardized compared with the other two?
Please teach me if you know their difference.
Thanks!

 

[Orodruin]

Non-relativistic physics is anything that does not apply special or general relativity.
Classical mechanics is classical mechanics and is a non-relativistic theory.
An example of a theory that is non-relativistic but that is not classical mechanics is basic quantum mechanics.

 

[louislaolu]

Non-relativistic physics is anything that does not apply special or general relativity.
Classical mechanics is classical mechanics and is a non-relativistic theory.
An example of a theory that is non-relativistic but that is not classical mechanics is basic quantum mechanics.

Thank you for the reply, Orodruin. Is it correct to say that non-relativistic physics is a broader concept than classical mechanics.
What about the term "low speed physics"? Do people still or ever use it?

 

[Orodruin]

Thank you for the reply, Orodruin. Is it correct to say that non-relativistic physics is a broader concept than classical mechanics.

Yes.

What about the term "low speed physics"? Do people still or ever use it?

I don't know who "people" are, but I don't think I have ever encountered that term as a general nomenclature for something.

 

[louislaolu]

I mean experts or scientists by "people". (English is not my native language, so I often fail to say what I mean)
Your explanation helps me a lot. Thank you so much!

 

[PeroK]

What about the term "low speed physics"? Do people still or ever use it?

It might be applied to those who take a long time to learn. Ironically, there's quite a lot of low speed physics in the relativity forum on here!

 

[vela]

Classical mechanics is classical mechanics and is a non-relativistic theory.

Some people would include relativistic mechanics as part of classical mechanics.

 

[Orodruin]

Some people would include relativistic mechanics as part of classical mechanics.

That is also acceptable to the effect of relativity being a classical theory (as opposed to a quantum theory).

 

[louislaolu]

It might be applied to those who take a long time to learn. Ironically, there's quite a lot of low speed physics in the relativity forum on here!

Thanks. What an interesting interpretation! I can come up with a new one: snail physics

 

[louislaolu]

Some people would include relativistic mechanics as part of classical mechanics.

Thanks.
I am trying to figure out why "low speed physics" in a science fiction was rendered into "classical mechanics (non-relativistic physics)" after the work was translated from Chinese into English. I assume that the translator meant to standardize the original term, but I have no evidence. I feel a canonical view of these terms might account for this better in this context.